Reducing-mill



(No Model.)

W. o. COFIELD.

RBDUGING MILL.

` Patented Apr. 7, 1896.

a "Il g /NVENTOH A TTOHNE YS.

- and other articles and substances in a very NIIED STATES AIENT OFFICE.

i VILLIAM O. OOFIELD, OF PIQUA, OHIO.

REDUClNG-IVIILL.

SPECIFICATION forming part of Letters Patent No. 557,973, dated April'7, 1896.

Application iiled April 9, 1895. Serial No. 545 ,079. (No model.)

To all whom t may concern.-

Beit known that I, WILLIAM O. COFIELD, of Piqua, in the county of Miamiand State of Ohio, have invented a new and ,Improved Reducingdvlill, ofwhich the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved reducing orgrinding mill which is simple and durable in construction, veryeffective in operation, and arranged for grinding or reducing grain,ore, chemicals,

simple and effective manner.

The invention consists of certain parts and details and combinations ofthe same, as will be fully described hereinafter, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a side elevation of the improvement. Fig. 2 is a sectionalside elevation of the same, and Fig. 3 is a sectional plan view of thesame on the line 3 3 of Fig. 2.

The improved mill is provided with a suitably-constructed frame A Amounted on legs, and supporting a casing B, made cone-shaped to form atits inside an inverted-cone-shaped grinding-surface on which rolls aninverted Vcone O, set into the said casing and having its lower apex endformed with a point O', set in a step formed by a screw D screwing in anut E, secured to or supported from the under side of the frame A. Inthe top or base end of the cone O is formed a central recess O2, intowhich ts an eccentric F, secured on the lower end of a shaft G, mountedto turn in suitable bearings ll and H', attached to the top of the frameA.

On the shaft G is secured a pulley l, con-N nected by a belt with othermachinery for imparting a rotary motion to the shaft G to cause theeccentric F to impart a rolling-olf motion to the said cone O to grindthe material placed between the cone and the grinding-surface of thecasing B. On the shaft G is also secured a y-wheel J, so as to insure asteady motion of the shaft G.

The lower end of the cone C nts comparatively snugly in the lower end ofthe casing. By adjusting the screw D the position of this lower end ofthe cone relative to the casing can be regulated toa nicety.

Now it will be seen that the material to be ground and introduced at theupper end of the casing BA is ground by the cone O rolling off on thegrinding-surface of the casing B. The ground material passes downward:in the casing B, to be finally discharged at the lower end thereof.

A mill constructed as shown and described can be used for almost anypurpose for which mills are usually employed-that is, for reducinggrains or chemicals and other substances.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patentl. A reducing-mill comprising a fixed casinghaving an invertedconeshaped grindingsurface, an inverted cone adaptedto roll upon the said surface to grind the material placed between thecone and the surface, said cone having a recess in its top or large endand an eccentric mounted on a revolving shaft and engaging the recess ofthesaid cone to impart a rolling motion to the latter, substantially asshown and described.

2. A reducing-mill comprising a fixed casing having aninverted-cone-shaped grindingsurface, an inverted cone adapted to rollupon the said surface to grind the material placed between the cone andthe surface, said cone having a central recess in its top or large endan eccentric mounted on a revolving shaft and engaging the said recessof the cone to impart a rolling motion to the latter, and a screwforming a step for the lower, pointed end of the said cone,substantially as shown 9o and described.

W'ILLIAM O. COFlElLD.

Witnesses OsoAR W. RIcHARDsoN, WM. C. JOHNSTON.

